Apparatus for making blue-prints.



PATENTED JUNE 9, 1903 J. V. MoADAM.

APPARATUS FOR MAKING BLUE PRINT.

APPLIOATIOK FILED APR. 9, 1903.

r yw L RS cu. PHoro-umq. vnsnmcmu a Patented June 9, 1903.

PATENT OFFIC JOHN V. MOADAM, OF ST. LOUIS, MISSOURI.

'APPARATUS FOR MAKING BLUE-PRINTS.

SPECIFICATION forming part of Letters Patent No. 730,553, dated June 9,1903.

Application filed April 9, 1908. Serial No. 161.835. (No model.) I

To all whom, it may concern.-

Be it known that I, JOHN V. MOADAM,a citizen of the United States,residing in the city of St. Louis, in the State of Missouri, haveinvented certain new and useful Improvements in Apparatus forgMakingBlue-Prints,of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, formingpart of this specification.

My invention relates to an apparatus for making blue-prints by the useof artificial light, and, briefly stated, it comprises a horizontallymounted rotatable transparent drum, means for conducting drawings andsensitized paper to and around said drum, a lamp positioned within saiddrum, and primary and secondary reflectors by which, the rays of lightfrom said lamp are projected through said drum to act upon the chemicalelements of the sensitized blue-print paper.

The invention consists in features of novelty hereinafter fullydescribed, and pointed out in the claims.

Figure I is a top or plan view of my apparatus. Fig. II is a verticalhorizontal section taken on line II II, Fig. I. Fig. III is a verticaltransverse section taken on line III III, Fig. I. Fig. IV is a sideelevation of the printing portion of the apparatus looking at the sidethereof at which the lamp is located.

1 designates a roll-containing box provided with a door 2 and in whichrolls A, of blueprint paper of varying widths, are mounted. The paper onthe rolls A is Withdrawn from the box 1 througha passage-way 3, locatedat the bottom of the box. The box 1 is supported by uprights 4.

5 designates endless carriers that are trav-.

elingly mounted upon an outer roller 6, supported in posts 7, and aninner roller 8, that is mounted and rotated in a manner to behereinafter explained.

9 and 10 designate standards, the former of which is located at theinner end of travel of the carriers 5 and which serves as a support forthe carrier-roller 8.

11 designates a pair of lower rollers journaled to the standards'lO andprovided with flanges 12. (See Fig. II.) The shaft of one of the rollers11 bearsa crank 14, by which said roller may be rotated. 15 designatesup:

per rollers journaled to the standards 9 and cated by the arrow, Fig.II, passing beneath.

the rollers 16 and 15, above the rollers 11, thence downwardly beneaththe forward one of said rollers, and rearwardly to the rear roller 11,from which it passes upwardlyand over the-upper rollers 15 and'returnsto the idler-roller 16. During such movement of the endless apron almosta complete circuitof the transparent drum 17is made when the apron istravelingly operated by the rotation of one of the lower rollers 11through the medium of the crank 14. During the travel of the apron 18the transparent drum is rotated within the inner portion of the circuitof said apron through the medium of the apron.

19 designates guide-fingers mounted upon a support 20 and having theirfree ends projecting rearwarclly between the endless carriers 5 and intoa position above the carriers and beneath the apron 18, where it passesunderneath the idler-roller 16 onto the drum 17. (See Fig. II.)

2I is a crossed driving-belt leading from the I forward roller 11 to theroller 8 and by which rotation is imparted to said roller 8 upon therotation of the roller 11 to effect the travel of the carriers 5. Thedrawings ofwhich blueprint copies are to be made are during theoperation of the apparatus, while the carriers 5 and endless apron 18are in motion, placed upon said carriers and are conducted rear- Wardlybeneath the roll-containing box 1.

As the sheetsof drawing pass beneath said box sensitized paper from oneof the rolls A is withdrawn from the box onto the drawing, and thesheets of drawing and sensitized paper are conducted to theguide-fingers 19, which present them in an upwardly-projected positionbetween the transparent drum 17 and the endless apron 18 travelingthereagainst. The drawings and sensitized paper are thus delivered tothe perimeter of the drum and are conducted thereabout in the rotationof the drum and travel of the apron, finally being discharged over theforward roller 11 beneath the drum.

22 designates a lamp, preferably of electricarc type, the burner 23 ofwhich is preferably positioned within the transparent drum 1'7.

24 is a conical reflector supported by a post 25 at one side of the druml7 and projecting into the interior of said drum and having its apexpresented to the burner of the lamp 22, as seen in Fig. III.

26 is a parabolical reflector positioned back of the lamp-burner 23 andopposing the conical reflector 24.

In the practical use of my apparatus the drawings and sensitized paperare conducted around the transparent drum 17in the manner hereinbeforefully set forth, and during the travel of the drawings and paper therays of light from the burner 23 are constantly projected through thetransparent drum to set the chemical ingredients upon the sensitizedpaper where unprotected by thelines of drawing, as in the usual practiceof making blue-prints. The parabolical reflector 26 receives the directrays of light from the burner 23 and projects them in a uniform manneronto the conical reflector, and the rays are refracted from said conicalreflector through the transparent drum. It will be seen that thelamp-burner 23 beingin position approximately central of the diameter ofthe transparent drum and the apex of the conical reflector 24 being in acorrelative position the strongest rays of light are projected onto theapex of the conical reflector, and therefore their strength forrefraction is much greater than that of the rays of light which areprojected onto the base of the conical reflector. This is important inthat the rays of light projected from the apex must be thrown a greaterdistance to reach the transparent drum from the location of the burnerthan those thrown from the base of the conical reflector after beingreflected thereonto from the parabolical reflector 26.

I claim as my invention 7 1. In an apparatus for making blue-prints, thecombination of a transparent drum, a conical reflector extending intosaid drum, aparabolical reflector facing said conical reflector,- and alamp positioned between said reflectors,- substantially as set forth.

2. In an apparatus for making blue-prints,- the combination of arotatable transparent drum, a conical reflector extending into saiddrum, a parabolical reflector facing said conical reflector, and a lamppositioned between said reflectors, substantially as set forth.

3. In an apparatus for making blue-prints, the combination of arotatably-mounted transparent drum, an endless apron traversing saiddrum, means for imparting motion to said apron to rotate said drum, aconical reflector extending into said drum, a parabolical reflectorfacing said conical reflector, and a lamp interposed between saidreflectors, substantially as set forth.

4. In an apparatus for making blue-prints, the combination of arotatably-mounted transparent drum, an endless apron traversing saiddrum and through the medium of which said drum is rotated, a conicalreflector extending into said drum, a parabolical reflector facing saidconical reflector, a lamp positioned between said reflectors, and meansfor conducting drawings and sensitized paper to said drum, substantiallyas set forth.

5. In an apparatus for making blue-prints, the combination of atransparent drum, reflectors situated within said drum, a lamppositioned between said reflectors, an endless apron traversing saiddrum, an endless carrier leading to said drum and endless apron, andguide-fingers projecting from said endless carrier into proximity withsaid endless apron, substantially as set forth.

JOHN V. MOADAM.

In presence of E. S. KNIGHT, M. P. SMITH.

